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Sir Arthur Stanley Eddington (1882-1844), British astronomer. Eddington is most famous for directing the 1919 solar eclipse expedition, the results of which confirmed the increased bending of starlight by the Sun as predicted in Einstein's theory of general relativity. His writings introduced Einstein's ideas to the English- speaking world, which was largely oblivious of advances in German science because of the First World War. He also determined the natural limit for the mass of a star, and the relationship between star mass and luminosity. He won Royal Medal of the Royal Society and the Bruce and Gold Medals of the Royal Astronomical Society (RAS), serving as president of the RAS from 1921- 3. He was knighted in 1930.